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Finding the Fourth Proportional to 9,939.86, 13,713.07 and 6,405.13

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Solution

The fourth proportional to 9,939.86, 13,713.07 and 6,405.13 is: 8,836.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,939.86 : 13,713.07 = 6,405.13 : x
  2. Step 2: Convert to fraction form
    9,939.86/13,713.07 = 6,405.13/x
  3. Step 3: Cross multiply
    9,939.86x = 13,713.07 × 6,405.13
  4. Step 4: Simplify right side
    9,939.86x = 87,833,895.46
  5. Step 5: Solve for x
    x = 87,833,895.46/9,939.86
  6. Step 6: Final answer
    x = 8,836.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.